Dry chemical extinguishers are portable fire-fighting devices that use a powder to extinguish flames. They are effective against various types of fires, including those involving flammable liquids, gases, and electrical equipment. The powder works by interrupting the chemical reaction of the fire, effectively smothering it. These extinguishers come in different sizes and classifications, such as ABC extinguishers, which can handle multiple fire types. They are commonly found in homes, offices, and industrial settings due to their versatility and ease of use. Regular maintenance and inspection are essential to ensure they function properly when needed.